package sample;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.StringRequestEntity;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpUtil {

	public static final String ENTER = "\r\n";

	public static final String CONTENT_TYPE = "text/html";
	
	public static final String ENCODING = "UTF-8";
	
	/**
	 * @throws IOException
	 * @throws HttpException
	 * 
	 */
	public static InputStream getMethodRequest(String url, String encoding) {
		
		HttpClient httpClient = new HttpClient();
		GetMethod getMethod = new GetMethod(url);
		getMethod.getParams().setContentCharset(encoding);
		getMethod.addRequestHeader("token", "F49E2C4589115480BB870DBC315A2832");
		
		String response = null;
		InputStream inputStream = null;
		try {
			int status = httpClient.executeMethod(getMethod);
			if (status == HttpStatus.SC_OK) {
				inputStream = getMethod.getResponseBodyAsStream();
				BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, ENCODING));
				StringBuffer stringBuffer = new StringBuffer();
				String str = "";
				while ((str = br.readLine()) != null) {
					stringBuffer.append(str);
				}
				// 处理内容
				response = stringBuffer.toString();
			}
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return inputStream;

	}

	/**
	 * @throws IOException
	 * @throws HttpException
	 * 
	 */
	public static String postMethodRequest(String reqStr, String url) {
		try {
			HttpClient httpClient = new HttpClient();
			PostMethod postMethod = new PostMethod(url);
			
			StringRequestEntity requestEntity = new StringRequestEntity(
					reqStr.toString(), CONTENT_TYPE, ENCODING);
			postMethod.setRequestEntity(requestEntity);


			httpClient.executeMethod(postMethod);
			
			InputStream inputStream = postMethod.getResponseBodyAsStream();
			BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, ENCODING));
			StringBuffer stringBuffer = new StringBuffer();
			String str = "";
			while ((str = br.readLine()) != null) {
				stringBuffer.append(str);
			}
			// 处理内容
			String response = stringBuffer.toString();
			
			postMethod.releaseConnection();

			return response;
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return null;
		
	}


	/**
	 * 向指定URL发送GET方法的请求
	 *
	 * @param url
	 *            发送请求的URL
	 * @param param
	 *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	 * @return URL 所代表远程资源的响应结果
	 */
	public String sendGet(String url, String param, String encoding) {
		StringBuffer stringBuffer = new StringBuffer();
		BufferedReader in = null;
		try {
			String urlNameString = url + "?" + param;
			URL realUrl = new URL(urlNameString);
			// 打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			// 设置通用的请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection", "Keep-Alive");
			connection.setRequestProperty("Accept-Charset", "utf-8");
			connection.setRequestProperty("contentType", "utf-8");
			connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			// 建立实际的连接
			connection.connect();
			// 获取所有响应头字段
			Map<String, List<String>> map = connection.getHeaderFields();
			// 遍历所有的响应头字段
			for (String key : map.keySet()) {
//				System.out.println(key + "--->" + map.get(key));
			}
			// 定义 BufferedReader输入流来读取URL的响应
//			in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
//			String line;
//			while ((line = in.readLine()) != null) {
//				result += line;
//			}

			if (StringUtil.isEmpty(encoding)){
				encoding = ENCODING;
			}

			InputStream inputStream = connection.getInputStream();
			BufferedReader br = new BufferedReader(new InputStreamReader(inputStream, encoding));
			String str = "";
			while ((str = br.readLine()) != null) {
				stringBuffer.append(str);
			}

		} catch (Exception e) {
			System.out.println("发送GET请求出现异常！" + e);
			e.printStackTrace();
		}
		// 使用finally块来关闭输入流
		finally {
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return stringBuffer.toString();
	}

	public static void main(String[] args) {
		HttpUtil httpUtil = new HttpUtil();

		String result = httpUtil.sendGet("http://127.0.0.1:80/api/topUpController/autoTopUpCallBack", "account=yanwei", "utf-8");
		System.out.println(result);

	}

}
